First Japanese Specimen-based Records of Cypho zaps (Perciformes: Pseudochromidae) from Yonaguni-jima Island, the Yaeyama Islands

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1 Species Diversity 21: November 2016 DOI: /sd First Japanese Specimen-based Records of Cypho zaps (Perciformes: Pseudochromidae) from Yonaguni-jima Island, the Yaeyama Islands Tomohiro Yoshida 1,3, Keita Koeda 2, and Hiroyuki Motomura 2 1 The United Graduate School of Agricultural Sciences, Kagoshima University, Korimoto, Kagoshima , Japan k @kadai.jp 2 The Kagoshima University Museum, Korimoto, Kagoshima , Japan hatampo@gmail.com (KK); motomura@kaum.kagoshima-u.ac.jp (HM) 3 Corresponding author (Received 30 April 2016; Accepted 7 July 2016) Three specimens ( mm standard length) of Cypho zaps Gill, 2004 (Pseudochromidae), previously known from voucher specimens only from Indonesia, the Philippines, and southern Taiwan, were collected off Yonaguni-jima island, Yaeyama Islands, southern Ryukyu Islands. They were clearly distinguished from the only known other congener, C. purpurascens (De Vis, 1884), by the staggered arrangement of the dark vertical lines in the center of each body scale, which do not form continuous bars as they do in the latter species. These specimens represent the first records of C. zaps from Japan supported by voucher specimens, and the northernmost distributional records of the species. Key Words: new record, distribution, Okinawa, Ryukyu Archipelago, Chequered Dottyback. Introduction The family Pseudochromidae comprises four subfamilies: viz., Anisochrominae, Congrogadinae, Pseudochrominae, and Pseudoplesiopinae (Godkin and Winterbottom 1985). The subfamily Pseudochrominae contains 10 genera with 80 species in the Indo-Pacific Ocean (Gill 2004), of which four genera with nine species have been recorded from Japanese waters (Hayashi et al. 2013). The genus Cypho Myers, 1940 of the Pseudochrominae contains two valid Pacific species (Gill 2004): C. purpurascens (De Vis, 1884) and C. zaps Gill, Cypho purpurascens is known only from the southwestern Pacific (northeast of Australia to Tonga; Gill 2004). Cypho zaps was originally described by Gill (2004) on the basis of 46 specimens collected from Indonesia, the Philippines, and Taiwan. Although he also reported this species from Yonaguni-jima island in the Yaeyama Islands, southern Japan, on the basis of an underwater photograph, the photograph was not shown in his article. Senou et al. (2007) subsequently reported this species from Shimoji-jima island in the Miyako Islands, again based on an underwater photograph. Allen and Erdmann (2012) included the Ryukyu Islands in the distributional range of this species, probably based on Gill s (2004) photographic record. During a joint ichthyofaunal survey at Yonaguni-jima island in September, 2015, by researchers from five Japanese universities, three specimens of C. zaps were collected off the island, which is the westernmost island in Japan (ca. 500 km southwest of Okinawa-jima island). These specimens are herein described as the first specimen-based records of C. zaps from Japan, and the northernmost record of the species based on voucher specimens. Materials and Methods Counts and measurements follow Gill (2004). Measurements were made to the nearest 0.1 mm with needle-point digital calipers under a dissecting microscope. The morphological description is based on the three specimens collected from Yonaguni-jima island. Curatorial procedures for the collected specimen followed Motomura and Ishikawa (2013). Institutional codes follow Sabaj Pérez (2014). The specimens of C. zaps examined in this study are deposited in the Kagoshima University Museum, Kagoshima, Japan (KAUM). Underwater photographs of C. zaps referenced in this study are registered at the Image Database of Fishes in the Kanagawa Prefectural Museum of Natural History, Odawara, Japan (KPM-NR). Cypho zaps Gill, 2004 [New Japanese generic name: Donan-megisu-zoku] [New standard Japanese name: Donan-megisu] (Figs 1 2; Tables 1 2) Cypho zaps Gill, 2004: 23, figs 8 10 (type locality: Batan Island, Philippines); Senou et al. 2007: 52, fig. 6 (Shimojijima island, Miyako Islands, Japan); Ho and Shao 2011: 42 (Green and Orchid islands and Kenting, Taiwan); Allen and Erdmann 2012: 323, lower figs (Halmahera and Raja Ampat Islands, Indonesia); Yang et al. 2013: 79, lower left 2016 The Japanese Society of Systematic Zoology

2 172 Tomohiro Yoshida et al. Fig. 1. Fresh specimens of Cypho zaps collected from Yonaguni-jima island, Japan. A, KAUM I , 35.6 mm standard length (SL), Rakuda Rock; B, KAUM I , 38.2 mm SL, off Hinan Port; C, KAUM I , 31.6 mm SL, off Umabana. side fig. (Orchid Island, Taiwan). Material examined. All from Yonaguni-jima island, Yaeyama Islands, Okinawa Prefecture, Japan: KAUM I , 35.6 mm SL, Rakuda Rock, N, E, 20 m depth, 17 September 2015, K. Koeda; KAUM I , 38.2 mm SL, off Kubura Hinan Port, N, E, 26 m depth, 18 September 2015, K. Koeda; KAUM I , 31.6 mm SL, off Umabana, N, E, 26 m depth, 22 September 2015, K. Koeda. Description. Body oblong, moderately deep and compressed, deepest at anus. Dorsal profile of head and body in side view convex from snout tip to caudal-fin base. Ventral profile of head and body in side view convex from lower-jaw tip to end of anal-fin base, straight at caudal peduncle. Head pointed, large, in SL. Anterior lateral line ending below base of 18th dorsal-fin soft ray. Posterior lateral line beginning below base of 18th dorsal-fin soft ray. Eye rounded, large, in HL. Pupil tear-drop shaped. Mouth small, slightly oblique, forming angle of ca. 30 to horizontal axis of body. Posterior margin of maxilla extending slightly beyond vertical drawn through center of pupil; upper-jaw length less than half head length. Two pairs of enlarged canine teeth on anterior part of

3 First Japanese records of Cypho zaps 173 Table 1. Meristics of Cypho zaps specimens from Japan and type specimens (western Pacific Ocean). This study Gill (2004) Non-types Yonaguni-jima island n=3 Holotype Philippines Paratypes Western Pacific n=17 Standard length (SL; mm) Dorsal-fin rays III, 23 III, 23 III, Anal-fin rays III, 14 III, 14 III, 14 Pectoral-fin rays Upper procurrent caudal-fin rays Lower procurrent caudal-fin rays Total caudal-fin rays Scales in lateral series Anterior lateral-line scales Anterior lateral line terminating beneath segmented dorsal-fin ray 15 18th 17th 15 21st Posterior lateral-line scales Scale rows between lateral lines Horizontal scale rows above anal-fin origin Circumpeduncular scales Pre-dorsal-fin scale rows Gill rakers = = =13 16 Pseudobranch filaments Circumorbital pores Preopercular pores Dentary pores Posterior interorbital pores each jaw; villiform teeth in 4 6 rows at symphysis, diminishing to 1 or 2 rows on sides of jaw in upper jaw. Villiform teeth in 1 or 2 rows in lower jaw. Two to 4 rows of tiny teeth on vomer and ectopterygoids. Anterior nostril with short tube, uppermost margin level with ventral margin of pupil. Posterior nostril oval, opening vertically, uppermost margin below level of middle of pupil. Opercular and preopercular margins smooth. Gill rakers slender, moderately long but shorter than gill filaments. Head nearly full-scaled, only region around nostrils and pores on snout unscaled; small scales on base of dorsal, anal, and caudal fins. Origin of dorsal fin anterior to vertical drawn through pectoral- and pelvic-fin origins; third spine of dorsal fin longest; 20th or 21st soft ray of dorsal fin longest. Origin of anal fin below base of eighth soft ray of dorsal fin; third spine of anal fin longest; 13th soft ray of anal fin longest. Origin of pelvic fin below central part of pectoral-fin base. Pectoral fin rounded, posterior tip reaching vertical drawn through base of seventh soft ray of dorsal fin. Posterior tip of depressed pelvic fin reaching vertical drawn through base of eighth soft ray of dorsal fin. Caudal fin rounded. Coloration when fresh Strength and intensity of color varying between specimens. Head bright orange-red to yellow, body bright orange-red to orange, with orange to yellow abdomen. Posterior and ventral margin of orbit dark-blue to blue. Scales of head and body, except abdomen, each with dark-blue to blue oblique bar in middle. Bars wider posteriorly on body. Bluish-grey stripe along dorsal margin of upper jaw curving posterodorsally and ending behind margin of eye. Pupil black; iris bright orange to yellow with two Fig. 2. Underwater photograph of Cypho zaps, off Yonaguni-jima island, 16 January 2012, taken by T. Uchiyama. diagonal and parallel dark-blue to blue bars, respectively located above and below pupil. Dorsal and anal fins bright orange-red to orange, lighter distally. One or two faint bluish-grey mid-lateral stripes on dorsal and anal fins. Outer margin of both fins bluish-grey. Pectoral fin semi-transparent without distinct markings. Pelvic fins semi-transparent yellow to orange with pale-blue anterior margin. Caudal fin bright orange-red to lighter orange distally, with faint bluish-grey mid-caudal stripe and bluish-grey outer margin. Coloration in life Based on underwater photographs taken at Yonaguni-jima island (Fig. 2): similar to coloration of fresh specimens, but whole body generally pale. Coloration of preserved specimens Head and body pale

4 174 Tomohiro Yoshida et al. Table 2. Morphometrics of specimens of Cypho zaps (expressed as percentages of SL) from Japan and type specimens (western Pacific Ocean). This study Gill (2004) Non-types Yonaguni-jima island n=3 Holotype Philippines Paratypes Western Pacific n=45 Standard length (SL; mm) Head length Orbit diameter Snout length Fleshy interorbital width Bony interorbital width Body width Distance from snout tip to posterior tip of retroarticular bone Pre-dorsal-fin length Pre-pelvic-fin length Distance from posterior tip of retroarticular bone to pelvic-fin origin Distance from dorsal-fin origin to pelvic-fin origin Distance from dorsal-fin origin to base of middle part of dorsal-fin ray Distance from dorsal-fin origin to anal-fin origin Distance from pelvic-fin origin to anal-fin origin Distance from middle of dorsal-fin ray base to end of dorsal-fin base Distance from middle of dorsal-fin ray base to anal-fin origin Distance from anal-fin origin to end of dorsal-fin base Anal-fin base length Distance from end of dorsal-fin base to end of anal-fin base Distance from end of dorsal-fin base to end of dorsal edge of caudal peduncle Distance from end of dorsal-fin base to end of ventral edge of caudal peduncle Distance from end of anal-fin base to end of dorsal edge of caudal peduncle Distance from end of anal-fin base to end of ventral edge of caudal peduncle st dorsal-fin spine length nd dorsal-fin spine length rd dorsal-fin spine length st segmented dorsal-fin ray length Length of 4th-to-last segmented dorsal-fin ray st anal-fin spine length nd anal-fin spine length rd anal-fin spine length First segmented anal-fin ray length Length of 4th-to-last segmented anal-fin ray Third pectoral-fin ray length Pelvic-fin spine length Second segmented pelvic-fin ray length Caudal-fin length tan; dark markings persistent on head and body scales. Dorsal, anal, and caudal fins with blackish distal margins and mid-lateral stripes. Distribution. Cypho zaps has been recorded from the western Pacific Ocean at the following localities: Kawa Island, Raja Ampat Islands, Indonesia (Gill 2004); Batan, Mavulis, and Sabtang islands, Batan Islands, and Luzon, Philippines (Gill 2004); Green and Orchid islands and Kenting, Taiwan (Gill 2004; Ho and Shao 2011); and Yonaguni-jima island, Yaeyama Islands, Japan (this study). Underwater photographs of C. zaps have been taken at West Papua and Sulawesi, Indonesia (Allen and Erdmann 2012); Orchid Island, Taiwan (Yang et al. 2013); Yonaguni-jima island, Japan (Gill 2004 used for color description, but unpublished; this study); Nakanougan-jima island (KPM-NR 22932), Hateruma-jima island (KPM-NR 13185, 26770), and Iriomote-jima island (KPM-NR 17116) (all Yaeyama Islands, Japan); Shimoji-jima island, Miyako Islands, Japan (Senou et al. 2007); and Kume-jima island, Okinawa Islands, Japan (KPM-NR 38916, 38917). The collection data for the preserved specimens indicates capture depths of 0 26 m, and the underwater photographs were taken at depths of 5 35 m. Remarks. The present specimens from Yonaguni-jima island were identified as a species of the genus Cypho, being clearly distinguished from other genera by the following combination of characters: dorsal-fin rays III, 22 24; analfin rays III, 13 15; circumpeduncular scales 14 17; vertebrae (Gill 2004). They were subsequently identified as C. zaps on the basis of having a vertical dark line centrally on each body scale, but with these lines being separated

5 First Japanese records of Cypho zaps 175 from each other and not forming continuous bars. This is a diagnostic character of the species according to Gill (2004). Most meristic and morphometric values for the present specimens lie within the ranges of those of the holotype and paratypes of C. zaps given by Gill (2004) (Tables 1 2). However, the Yonaguni-jima island specimens differed slightly in morphometric measurements from the type series of C. zaps as follows: head length % SL [vs % SL in the latter]; snout length % SL (vs %); fleshy interorbital width % SL (vs %); pre-pelvic-fin length % SL (vs %); distance from posterior tip of retroarticular bone to pelvic-fin origin % SL (vs %); distance from pelvic-fin to analfin origin % SL (vs %); distance from middle dorsal-fin ray base to anal-fin origin % SL (vs %); second dorsal-fin spine length % SL (vs %); length of fourth to last segmented dorsalfin ray 16.4% SL (vs %); and length of fourth to last segmented anal-fin ray % SL (vs %) (Table 2). Since the SL range of the specimens examined in this study was within that of the specimens described by Gill (2004), these minor morphometric differences are regarded as intraspecific variation of C. zaps. Gill (2004) provided color descriptions of both fresh and preserved mature male and preserved female specimens of C. zaps, but did not mention the fresh female coloration. Allen and Erdmann (2012: 323) later presented underwater photographs of mature male and female individuals, and indicated sexual coloration differences. All specimens collected from Yonaguni-jima island and those photographed underwater there and elsewhere in Japanese waters were males, the coloration of which agreed well with that of males described by Gill (2004) and illustrated by Allen and Erdmann (2012). Although C. zaps has been recorded previously from the Ryukyu Islands on the basis of underwater photographs (see distribution), the northernmost record of the species based on collected specimens has been considered to be Green Island, Taiwan (ASIZT P ; BMNH ). Therefore, the present three specimens collected from Yonaguni-jima island represent the first records of C. zaps from Japan supported by voucher specimens, and the northernmost record of the species. New Japanese names, Donan-megisu-zoku and Donanmegisu, are herein proposed for the genus and species, respectively, on the basis of one specimen (KAUM I ). The proposed species name is a combination of donan, from the local name for Yonaguni-jima island, and megisu, the common Japanese name for members of the family Pseudochromidae. Acknowledgments We are especially grateful to T. Uchiyama (Diving Service MARLIN) for his help in the field survey and for providing an underwater photograph. We thank K. Eguchi, T. Inaba, and T. Uejo (KAUM); Y. Kimura, S. Tanaka, and M. Fujisawa (Hiroshima University); Y. Hibino, D. Sasaki, T. Furukawa, and H. Suzuki (Mie University); R. Miki and H. Wada (University of Miyazaki); and T. Kunishima and M. Sakurai (University of the Ryukyus) for their help in field collection and examination of specimens, and G. Hardy (Ngunguru, New Zealand) for reading the manuscript and providing help with the English. We also thank H. Senou (KPM) for the opportunity to examine underwater photographs. This study was supported in part by a Grant-in-Aid from the Japan Society for the Promotion of Science, Tokyo, Japan (JSPS) to JSPS Fellows (PD: ) to the second author, plus Grants-in-Aid for Scientific Research (A: , B: , and C: and ) from JSPS; the JSPS Core-to-Core Program, Research and Education Network on Southeast Asian Coastal Ecosystems ; the Coastal Area Capability Enhancement in Southeast Asia Project of the Research Institute for Humanity and Nature, Kyoto, Japan; the Biological Properties of Biodiversity Hotspots in Japan project of the National Museum of Nature and Science, Tsukuba, Japan; and the Establishment of Research and Education Network on Biodiversity and Its Conservation in the Satsunan Islands project of Kagoshima University adopted by the Ministry of Education, Culture, Sports, Science and Technology, Japan. References Allen, G. R. and Erdmann, M. V Reef Fishes of the East Indies. Vols 1 3. Tropical Reef Research, Perth, xiii+1292 pp. Gill, A. C Revision of the Indo-Pacific dottyback fish subfamily Pseudochrominae (Perciformes: Pseudochromidae). Smithiana Monographs 1: 1 214, pls Godkin, C. M. and Winterbottom, R Phylogeny of the family Congrogadidae (Pisces; Perciformes) and its placement as a subfamily of the Pseudochromidae. Bulletin of Marine Science 36: Hayashi, M., Aizawa, M., and Doiuchi, R Pseudochromidae, dottybacks. Pp , In: Nakabo, T. (Ed.) Fishes of Japan with Pictorial Keys to the Species Third Edition. Tokai University Press, Hadano. [In Japanese] Ho, H.-C. and Shao, K.-T Annotated checklist and type catalog of fish genera and species described from Taiwan. Zootaxa 2957: Motomura, H. and Ishikawa, S. (Eds) Fish Collection Building and Procedures Manual. English Edition. The Kagoshima University Museum, Kagoshima and the Research Institute for Humanity and Nature, Kyoto, 70 pp. (Available at kagoshima-u.ac.jp/staff/motomura/dl_en.html) Sabaj Pérez, M. H Standard symbolic codes for institutional resource collections in herpetology and ichthyology: an online reference. Version 5.0. American Society of Ichthyologists and Herpetologists, Washington, DC. Available at (3 February 2016). Senou, H., Kobayashi, Y., and Kobayashi, N Coastal fishes of the Miyako Group, the Ryukyu Islands, Japan. Bulletin of the Kanagawa Prefectural Museum (Natural Science) 36: Yang, C.-J., Yang, C.-M., and Li, J.-J A Comprehensive Guide to Diving on Orchid Island. National Museum of Marine Biology and Aquarium, Checheng, 360 pp.

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